Willstar 4Pack 90 Degree Positioning Squares Right Angle Clamps, 4.7" x 4.7" Aluminum Alloy L-Type Corner Clamp Woodworking Carpenter Clamping Tool for Picture Frame Box Cabinets Drawers

The first thing I did when I got these was to check them for square with my 2 best squares. They weren't quite perfect, but REALLY close. The inside seems to be perfect and the outside is just slightly off, but very, very little. Maybe the thickness of a standard piece of printer paper at the end of the clamp. That is plenty good for any work I will be doing and at this price, I think it's a bargain.They are very stiff and have no noticeable flex in them.I haven't actually used them yet, but I can't imagine how they wouldn't work for my needs

Well packaged and they've got some heft to them. I'm new to diy/woof working, but these already seem like a must-have for the workshop (or two saw horses on my apartment patio).

As soon as I got them in the mail, I checked for square with one of my many Woodpecker squares and it was dead on. Items were well packaged and in perfect condition. I'm definitely going to purchase another set as a backup, especially for the price I got them for.

I love them. Assembling cabinets and boxes with these are much faster and accurate. They also serve as square with markings in cm and inch. The foam packing is very nice and i use them as a carrying case to keep them from scratching. Nice unexpected bonus.